706 THE BLOOD-VASCULAR SYSTEM OF THE OX 
is in apposition with the atrio-ventricular rings, and is irregularly triangular in 
form. Its left face is concave and gives attachment to the right posterior cusp of 
the aortic valve. The right surface is convex from before backward. The base 
is dorsal. The posterior border bears two projections separated by a notch. It 
is usually a little more than an inch (ca. 4 cm.) in length. The left bone is smaller 
and is inconstant. Its concave right border gives attachment to the left posterior 
cusp of the aortic valve. There is a large muscular moderator band in the right 
Aorta 
Ligamentum arteriosum 
! Left branch of pulmonary artery 
Anterior vena 
2, ay . 
cava | Pulmonary veins 
Posterior vena cava 
Brachiocephalic 
trunk 
Right auricle 
Pulmonary artery 
Vena hemiazygos 
Left auricle 
Posterior branch of left 
coronary artery in 
intermediate groove 
Left ventricle 
Right ventricle 
Left coronary artery 
Fie. 592.—Heart or Ox; Lerr View. 
The ventricles are contracted. 
ventricle, which extends from the base of the anterior septal papillary muscle to the 
lateral wall at the base of the papillary muscle there. In the left ventricle there 
are several branched moderator bands. 
THE ARTERIES! 
The great arterial trunks in the thorax resemble those of the horse in general 
disposition. 
; 
1 Only the most important differential features of the arrangement of the vessels as compared 
with those of the horse will be considered. I 
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